diff --git a/m4/acinclude.m4 b/m4/acinclude.m4
index 001ff33f..dc18d215 100644
--- a/m4/acinclude.m4
+++ b/m4/acinclude.m4
@@ -40,7 +40,7 @@ AC_DEFUN([AC_BUILD_PARTS],
       case "$withval" in
         yes) build_clients="yes" ;;
         no)  build_clients="no" ;;
-        *) AC_MSG_ERROR([bad value $withval for --with-client]) ;;
+        *) AC_MSG_ERROR([bad value $withval for --with-clients]) ;;
       esac
     ],
     [ build_clients="$build_all" ])